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PM6685 Datasheet(PDF) 44 Page - STMicroelectronics

Part # PM6685
Description  Dual step-down main supply controller with auxilary voltages for notebook system power
PDF  52 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM6685 Datasheet(HTML) 44 Page - STMicroelectronics

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Bootstrap circuit
The external bootstrap circuit is represented in the next figure:
Figure 40. Bootstrap circuit
The bootstrap circuit capacitor value CBOOT must provide the total gate charge to the high
side MOSFET during turn on phase. A typical value is 100nF.
The bootstrap diode D must charge the capacitor during the off time phases. The maximum
rated voltage must be higher than VINmax.
A resistor RBOOT on the BOOT pin could be added in order to reduce noise when the
phase node rises up, working like a gate resistor for the turn on phase of the high side
MOSFET.
P
PH
HA
AS
SE
E
C
CBBOOOOTT
R
RBBOOOOTT
L
LD
DO
O5
5
B
BO
OO
OT
T
D
D
L
L



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